在Java 9中，我们如何使用钻石操作符与匿名类？

public class DiamondOperatorTest {
   public static void main(String args[]) {
      <strong>Handler<Integer></strong> intHandler = new <strong>Handler<>(1)</strong> {
         <strong>@Override</strong>
         public void handle() {
            System.out.println(data);
         }
      };
      intHandler.handle();

      <strong>Handler<? extends Number></strong><!--? extends Number--> intHandler1 = new <strong>Handler<>(2)</strong> {
         <strong>@Override</strong>
         public void handle() {
            System.out.println(data);
         }
      };
      intHandler1.handle();

      <strong>Handler<?></strong><!--?--> handler = new <strong>Handler<>("test")</strong> {
         <strong>@Override
</strong>         public void handle() {
            System.out.println(data);
         }
      };
      handler.handle();
   }
}

abstract class Handler<T> {
   public T data;
   public Handler(T data) {
      this.data = data;
   }
   abstract void handle();
}

<strong>1
2
test</strong>